<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
	<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/css/bootstrap.min.css">
	<style>
      .shangpin{
      	height: 200px;
      	background: #ccc;
      	margin-bottom: 20px;
        text-align: center;
      }
	</style>
</head>
<body>
<div class="container">
  <div class="row">
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3">
      <div class="row">
        <div class="col-6">
          <div class="shangpin">商品</div>
        </div>
        <div class="col-6">
          <div class="shangpin">商品</div>
        </div>
        <div class="col-6">
          <div class="shangpin">商品</div>
        </div>
        <div class="col-6">
          <div class="shangpin">商品</div>
        </div>
      </div>
    </div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
    <div class="col-6 col-sm-3 col-md-3"><div class="shangpin">商品</div></div>
  </div>
</div>
</body>
</html>